During an exceptionally scary year, genre fans were able to find solace in a creative batch of horror movies. In a sign of the times, many titles mimicked the isolation of quarantine, with protagonists trapped deep in the ocean (“Underwater”), at a snowy retreat (“The Lodge”), in an Airbnb from hell (“The Rental”) or even in their own minds (“Possessor,” “Relic”). Variety has picked 16 of the best titles of the year.